How to calculate the molecular weight of a mixture
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The components of the residue oil and their volume fractions are known. How to calculate the molecular weight of residual oil.
It can only be considered as the average molecular weight; it is obtained by multiplying the molecular weights of the components and then summing them up
The molecular weight of a mixture is the sum of all the values obtained by multiplying the molecular weight of each substance by its mole fraction in the mixture.
For a mixture, only the average molecular weight can be calculated. This is obtained by multiplying the molecular weight of each substance by its mole fraction in the mixture, and the sum of these values gives the average molecular weight of the mixture. The original poster said that the components of the residue oil and their volume fractions are known; I’m curious as to how you obtained this information. Oil is a very complex mixture, and it’s difficult to separate out each individual substance. The average molecular weight of petroleum products can be determined through analytical methods.
The components and volume fractions are determined through laboratory analysis, but the molar fractions are not easy to obtain
The molecular weight of a mixture is the sum of the products of the volume fraction or molar fraction of each component and the molecular weight of that component. For example, to find the molecular weight of a mixture consisting of 20% carbon dioxide and 80% oxygen, the calculation is: 0.2*44 + 0.8*32 = 34.4. I’m not sure if this answer is correct~~~